Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interest	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest
Beginning balance at Dec. 31, 2013	$ 4,470,306	$ 0	$ 808	$ 1,566,985	$ 2,953,809	$ 178,689	$ (239,234)	$ 9,249
Beginning balance (in shares) at Dec. 31, 2013			80,841,000				(8,155,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under employee and director stock plans	(1,326)		$ 3	(1,113)			$ (216)
Shares issued under employee and director stock plans (in shares)			229,000				(2,000)
Stock-based compensation expense	27,961			27,961
Tax benefit from stock-based compensation	5,054			5,054
Distribution to noncontrolling interest, net of adjustments	(1,087)							(1,087)
Noncontrolling earnings	289							289
Currency translation adjustment on non-controlling interests	(2,339)							(2,339)
Acquisition of noncontrolling interest, net of taxes	0				1,305			(1,305)
Currency translation adjustment	(607,351)					(607,351)
Pension prior service cost and actuarial gain (loss)	(659)					(659)
Net income	531,965				531,965
Ending balance at Dec. 31, 2014	4,422,813	0	$ 811	1,598,887	3,487,079	(429,321)	$ (239,450)	4,807
Ending balance (in shares) at Dec. 31, 2014			81,070,000				(8,157,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
IVC Group acquisition	153,096			129,445			$ 23,651
IVC Group acquisition (in shares)							806,000
Shares issued under employee and director stock plans	(6,530)		$ 2	(6,536)			$ 4
Shares issued under employee and director stock plans (in shares)			210,000
Stock-based compensation expense	32,552			32,552
Tax benefit from stock-based compensation	5,668			5,668
Accretion of redeemable noncontrolling interest	(194)	194			(194)
Noncontrolling earnings and redeemable noncontrolling interest	256	1,428						256
Noncontrolling earnings	1,684
Currency translation adjustment on non-controlling interests	(970)	(713)						(970)
Acquisition of noncontrolling interest, net of taxes	3,117	21,043			520			2,597
Currency translation adjustment	(360,147)					(360,147)
Pension prior service cost and actuarial gain (loss)	(4,100)					(4,100)
Net income	615,302				615,302
Ending balance at Dec. 31, 2015	4,860,863	21,952	$ 813	1,760,016	4,102,707	(793,568)	$ (215,795)	6,690
Ending balance (in shares) at Dec. 31, 2015			81,280,000				(7,351,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under employee and director stock plans	(8,226)		$ 2	(8,232)			$ 4
Shares issued under employee and director stock plans (in shares)			239,000
Stock-based compensation expense	35,059			35,059
Tax benefit from stock-based compensation	4,697			4,697
Accretion of redeemable noncontrolling interest	(123)	123			(123)
Noncontrolling earnings and redeemable noncontrolling interest	340	2,864						340
Noncontrolling earnings	3,204
Currency translation adjustment on non-controlling interests	(26)	(1,243)						(26)
Acquisition of noncontrolling interest, net of taxes	0				(32)			32
Currency translation adjustment	(36,702)					(36,702)
Pension prior service cost and actuarial gain (loss)	(2,757)					(2,757)
Net income	930,362				930,362
Ending balance at Dec. 31, 2016	$ 5,783,487	$ 23,696	$ 815	$ 1,791,540	$ 5,032,914	$ (833,027)	$ (215,791)	$ 7,036
Ending balance (in shares) at Dec. 31, 2016			81,519,000				(7,351,000)